Add a Matrix type and cube gemetry generation helper functions. BUG=angle:521 Change-Id: Ia50be1790d6f440499eea052f427762637f3c876 Reviewed-on: https://chromium-review.googlesource.com/188727Reviewed-by:Shannon Woods <shannonwoods@chromium.org> Reviewed-by:
Jamie Madill <jmadill@chromium.org> Tested-by:
Geoff Lang <geofflang@chromium.org>